that instruction is for 188.8.131.52, this is made from version 184.108.40.206-1
the /data/data/ function is not yet available in this version
you should not run system apps from the sd
/data/app and /data/app-private get linked and moved to the sd-ext partition which is mounted as (named) /system/sd
/data/data stays on internal to protect personal data.
/data/dalvik-cache can be moved for further free space although i had stability issues with this
i did move dalvik to /cache using
and that seems ok until i add many apps guess dalvik gets too big for that partition